Reinforced concrete railway sleeper



May 11., 1954 s. A. MoRK REINFORCED CONCRETE RAILWAY SLEEPER Filed Dec.15. 1949 l v Heinrs Patented May 11, 1954 REINFORCED CONCRETE RAILWAYSLEEPER Sverre Alfred Mork, Trondheim, Norway Application December 15,1949, Serial No. 133,155

(Cl. 23S-84) 1 Claim. l

This` invention relates to a railway sleeper made of reinforcedconcrete, preferably with an asphalt covering when necessary againstalkaline water and poisonous soil. Itconsists of three concrete parts.The third part, which is of cylindrical or the like form, is arrangedbetween the two other parts and together with pads iill up the spacebetween these. The two parts of the sleeper on both sides of said thirdpart are resiliently secured together by members holding a hard-rubberwasher.

The invention also provides for improvements as tol the fastening of therails to the sleeper. These improvements also include arrangements inorder to reduce the effect of wheel shocks against the rail joints,particularly in curves, and thereby reduce the stress on the resilientconnecting means of the sleeper parts.

`The type of concrete sleepers previously made in two parts is nowimproved by the three parts system, that gives a double adjustingpossibility for widening of the track width at curves.

`The essential features of the present invention are as follows: Each ofthe two end parts of the sleeper consists of reinforced concrete and areon the transversal sides, which face each other, formed in such a waythat they embrace a third part 1of the sleeper, which part has acylindrical or the like form andis made of concrete. Between the twoouter parts of the sleeper, and between each of them and the cylindricalpart, are provided pads of perforated sheet metal formed like rasps andwith asphaltA paper or other suitable material pressed down and againstboth sides oi the perforated metal plates. The connecting arrangementbetween the two end parts of the sleeper comprises longitudinal bolts,which are joined to each other in pairs by means of transverse bolts.The shanks of the top pair of longitudinal bolts may be loopedpreferably substantially at the middle, while the Shanks of the lowerpair of bolts are preferably straight.

According to a feature of the invention transversal eyebolts are screwedinto threaded pipes, which pipes are oiled on their inside and are castinto `the end parts of the sleeper. Between the iron washers and thenuts of the longitudinal connecting bolts and the transverse eyeboltsare provided washers of hard-rubber or the like to giveexibility. i i

i The fastening of the rails to the sleeper is eifected by means ofanchoring bolts whose heads grip across the rails, each bolt being heldin a branched socket cast into the sleeper, and having at the end of thebolt a projecting toe which projects under a shoulder of the branch ofthe socket, preferably under a piece of hard steel Welded to saidshoulder and secured there by a lock bolt placed at the back side of theanchoring bolt in the socket. The heads of the bolt grip across the tieplate.

The bolts are interlocked by a cover clinched over their heads, tyingthem together.

The socket is to be filled with pitch oil which lubricates and preventsformation of rust as well as wear and tear. and makes it easy to replacethe bolts.

The bolts for fastening the rails to the sleeper have arrangments tocounteract the pressure sideways. For this purpose the head of theanchor bolt on the outer side of the rail is provided with an upwardextension which serves as a bearing for a shaft carrying a wheel of hardrubber which thrusts against the web of the rail.

In order to prevent sleepers from sliding along the rails on steepgradients, the anchoring bolts are provided with a set screw and a locknut, that when tightened hold the sleepers in place relatively to therails. Between the tieplate and the concrete sleeper is placed a platewhich is perforated and formed like a rasp on both sides, on which sidesare pressed asphalt paper or the like material.

Each of the outer parts is provided with reinforcing members forprestressing the concrete.

The above described railway sleeper has essential advantages:

Owing to the third cylindrical concrete part between the outer parts ofthe sleeper, adjustment of the distance between the rails in curves caneasily be performed by dividing the difference in rail gauge by one halfon each of the outer parts of the sleepers. The spaces between each ofthe outer parts and the cylindrical part of the sleeper are lled withpads, as mentioned above.

The parts of concrete sleeper will be held in proper place. The stresseson the connecting bolts and sleeper parts are likewise reduced by theflexible arrangement of the hard-rubber washers and the hard-rubberwheel against the rails.

By making the sleeper in the way described the production may besimplied, as each of the j outer parts of the sleeper are alike, anadvantage not obtained when the parts are made with key and slot. As thetransverse eyebolts are screwed into oil pipes and because of thewashers of hardrubber between the nuts of the longitudinal bolts andthetransversal eyebolts, easy replacement of Fig. 3 shows details of thethree main parts of the sleeper, with the pads andthe pipes, that aremoulded into the end parts of the sleeper.

Fig. 4 shows in perspective said pads and the cylindrical part of thesleeper, whichistobe embraced by the pads.

Fig. 5 shows in detail the transverse members consisting of the pipeswith inside threadsftobe Y cast into the end parts of the sleeper, andthe eyebolts to be screwed into the pipes.

Fig. 6 is an enlarged sectional View vof theanchorage bolts and the railwith the rail'tie-plate. The figure also-shows the arrangement tocountei-act the pressure sideways of the train.

Fig. 7 shows in detail a planview of the pad used between the sleeperandthe rail tie-plate and which consists of a plate ofsheet'metaLperforated and formed like a rasp, against the sides of whichis pressed asphalt paper or similar material.

Fig. 8 is a detail view of the hard rubber washer. The reference.letters a and b indicate the two outer or end concrete parts of thesleeper and c the cylindrical concrete part, which is placed between theparts a and b. 'Between a and b respectively and between each of theseparts and part c are provided pads, each consisting of plates d1 and e1,see Fig. 4, part of which has a half cylindrical profile to lt into halfcylindrical recesses in the parts a and b and to embrace part c. Theplates. di and e1 are perforated and serrated around the holes, so thatboth sides of the plates become similar to a rasp. Asphalt paper orother suitable material dz and e2 respectively is pressed against eachside of the plates.

The longitudinal bolts which interconnect the outer or end parts of thesleeper consist of the numbers il and f2, which in their middle'part arelooped, and of the numbers g1 and g2 which are straight. The bolts f1and f2 interconnect the sleeper parts a and b by means of theeyebolts h1and h2, each of which is screwed into a transverse and threaded pipe'k,moulded into part a, and further by means of the eyebolts 7'1 and i2,each screwed into another ppela'moulded into sleeper part b. The pipes1c are lled with pitch oil and handy replacements of the eyebolts, ifdesired. Nuts` Z hold the longitudinal bolts to the transverse eyebolts.

Between each of the eyebolts jrandy'z and the nut l on the respectinglongitudinal bolt is a` washer m made of hard-rubber, andalso a steelwasher n. The bolts gi and g2 connect .the parts a and b by means of theeyebolts o1 and o2 and p1 and p2 screwed into pipes lc. Each 'of theeyelets 01 and oz is provided with a square hole which isengaged by asquare portionat the end ofthe respecting tie bolts g1 and g2, each .ofwhich is provided with a head q placed against the outside of theeyebolts. Each of the-bolts g1 and g2 is threaded on the opposite endandcarries attaching nuts Z for securing to the eyebolts p1 and p2. As forthe upper pair of bolts, Va lrubber 4 washer m. and a steel washer n areplaced in between each of the eyebolts 101 and p2 and nut Z on thelongitudinal bolt g1 and g2 respectively.

Between each of the rails c and the sleeper are placed an ordinary tieplate w and a pad ai, which pad, as above mentioned, consists of aperforated and raspformed sheet metal plate with asphalt paperpressedagainst both sides. The anchoringlof the Yrails .to the sleeper is suchthat vertical branching sockets are moulded into the sleeper andarranged for receiving a projection or bending of the bolt r or a:respectively, which Vbolts-connect `the rails with the sleeper. Each ofthe sockets also receives a lock bolt z' connected with the anchoringbolt by means of a cover a2. whichispressed down upon the heads of theanchoringboltandithe lockbolt, thus securing the bolts.

To counteract the sideways pressure on the rail from the train, theouter anchor bolt r (see Fig. 6) is provided with an arm s which carriesa bearing for a shaft t, carrying a wheel u of hard-rubber or similarmaterial, which the wheel vthrusts against the web of the rail o. Inorder to hold the `sleeper and the rail together with a tight grip, theanchoring bolts 'throughthe headare providedv witha set screw y and alock nut, which will press the toe a: of the anchoring bolt-against thesteel plate .e of the socket ae.

Letter indicates the reinforcing members, used to obtain thepre-stressed concrete structure.

I claim:

A rail anchoring device for securing a rail to a tie having a verticalbore therein formed with a laterally enlarged lower portion defining adownwardly facing inclined shoulder; said anchoring device comprising ananchoring bolt havingr a head extending laterally y,from one end foroverlying the `base flange of a rail onthe tie and alaterally extendinginclined toe projection on the other end formed to extend looselythrough the vertical bore and to underlie the inclined shoulder inparallel relationship to the latter, a locking bolt having a shankdimensioned to extend into the vertical bore alongside said anchoringbolt and'to fill the bore for preventing lateral movement of `saidanchoring bolt in the bore, a clamping bolt extending threadedly downthrough said head of the anchoring bolt for bearing at itslower endagainst the base iiangeof the secured rail to thereby urge said inclinedtoe projection into bearing engagement with the downwardly facinginclined shoulder so that the bearing engagement of the inclined toeprojection and shoulder causes the anchoring bolt to'bear laterallyagainst said locking bolt and prevent removal of the latter from thebore, an arm projecting upwardly from said head of the anchoring bolt,and a roller member mounted on the upper end ofsaid arm for engagementagainst the web of thesecured rail to resist outward lateral rollingmovement of the latter.

vReferences Cited in the file of this patent Falk Feb. 24, 1925

